why would you want to do that FFS?
not only would it look really fucked it would handle like shit
cunt of an idea IMO

I've seen a 200 in Melbourne... that's probably enough.

200 is good, been running them for 6 years on my street bob, I wouldn't go any bigger for cost and handling reasons

I've seen a 350 on a Superglide. Looked absolutely ridiculous! Anything over 200 is a waste of time on a Dyna.. They aren't V-Rods. Everyone has their own opinion though!

Zodiac do a 250 kit  for 2006 and up, comes with Swing Arm Wider Rear Struts, Shock Mounts, Brake Caliper Mount, Primary Spacers, Extended Gear Box Shaft ,Rear Ale Adjusters Crankshaft Extension , Extended Push Rod and Gaskets, 

I sell them for $3300.00